Method for treating tissue with a wet electrode and apparatus for using same

a tissue and electrode technology, applied in the field of tissue treatment methods and electrodes, can solve the problems of limited power that can practically be delivered to patients, tissue heat, and prior art lesion producing devices utilizing infused conductive liquid have failed to recognize the importance of maintaining a specific range of current density distributed over the effective electrode area

Inactive Publication Date: 2005-05-03
PROJECT TROJAN INTPROP ACQUISITION LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Radio frequency energy passing from an electrode of such a device through the adjoining tissue causes heating of the tissue.
Unfortunately, the amount of power that can practically be delivered to a patient is limited by physiological factors.
Prior art lesion producing devices utilizing an infused conductive liquid have failed to recognize the importance of maintaining a specific range of current density distributed over the effective electrode area.

Method used

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  • Method for treating tissue with a wet electrode and apparatus for using same
  • Method for treating tissue with a wet electrode and apparatus for using same
  • Method for treating tissue with a wet electrode and apparatus for using same

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Embodiment Construction

[0018]The method and apparatus of the present invention are for treating a mammalian body, such as a human patient. Such apparatus is part of a system 11 and can be in the form of a transurethral needle ablation apparatus or device 12 similar to the apparatus shown in U.S. Pat. No. 5,964,756 and in U.S. patent application Ser. No. 09 / 684,376 filed Oct. 5, 2000, the entire content of each of which is incorporated herein by this reference. Device 12 includes a reusable handle 13 on which there is mounted a detachable cartridge 14. The needle electrodes of the device are supplied with radio frequency energy from a radio frequency generator and controller 16, which can be similar to the type commercially available from Medtronic, Inc. of Minneapolis, Minn. The device 12 is further supplied with a conductive liquid such as a saline solution provided from one or more reservoirs and preferably from a saline supply 17 (see FIG. 2). Controller 16 is preferably coupled to the saline supply 17...

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Abstract

A method for treating tissue of a mammalian body in which the conductivity of the tissue is characterized. The amount of a conductive liquid to supply to the tissue is determined as a function of the conductivity of the tissue and injected into the tissue over an interval of time. Electromagnetic energy is supplied to the tissue to form a lesion in the tissue. A computer-readable memory and a radio frequency generator and controller utilizing such method are further provided.

Description

FIELD OF THE INVENTION[0001]This invention pertains generally to methods and apparatus for treating tissue and, more particularly, to methods and apparatus for treating tissue utilizing a wet electrode.BACKGROUND[0002]Medical devices have been provided for treating benign prostatic hyperplasia by the use of radio frequency energy. See, for example, U.S. Pat. Nos. 5,370,675, 5,421,819 and 5,549,644. Radio frequency energy passing from an electrode of such a device through the adjoining tissue causes heating of the tissue. In order to cause tissue ablation and subsequent necrosis, the treated tissue is heated to a temperature in excess of 47° C.[0003]Radio frequency generators can be provided with power levels up to several hundred watts for accomplishing such ablation and necrosis. Unfortunately, the amount of power that can practically be delivered to a patient is limited by physiological factors. For example, when a patient is unconscious under a general anesthetic, a few hundred w...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): A61B18/12A61B18/14
CPCA61B18/1206A61B18/1482A61B18/1477A61B2018/1472A61B2018/00797A61B2018/00875A61B2018/1425A61B2018/00702
Inventor MCGAFFIGAN, THOMAS H.
Owner PROJECT TROJAN INTPROP ACQUISITION LLC
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